Frequencies for first 10,000 rows of route variable in drug2017q2 dataset :

     The route of drug administration |      Freq.     Percent        Cum.
--------------------------------------+-----------------------------------
                                      |      2,377       23.77       23.77
                               Buccal |          1        0.01       23.78
                            Cutaneous |          3        0.03       23.81
                               Dental |          2        0.02       23.83
                          INTRACAVITY |          1        0.01       23.84
                        Intra-uterine |          5        0.05       23.89
                        Intramuscular |        110        1.10       24.99
                          Intraocular |          3        0.03       25.02
                      Intraperitoneal |          3        0.03       25.05
                          Intrathecal |          4        0.04       25.09
Intravenous (not otherwise specified) |        765        7.65       32.74
                    Intravenous bolus |         19        0.19       32.93
                     Intravenous drip |        116        1.16       34.09
                                Nasal |         14        0.14       34.23
                           Ophthalmic |         17        0.17       34.40
                                 Oral |      3,365       33.65       68.05
                        Oropharingeal |          3        0.03       68.08
                                Other |         63        0.63       68.71
                           Parenteral |         34        0.34       69.05
                               Rectal |          5        0.05       69.10
             Respiratory (inhalation) |        111        1.11       70.21
                         Subcutaneous |        499        4.99       75.20
                            Subdermal |          6        0.06       75.26
                           Sublingual |          7        0.07       75.33
                              Topical |         50        0.50       75.83
                          Transdermal |        124        1.24       77.07
                       Transplacental |        143        1.43       78.50
                              Unknown |      2,130       21.30       99.80
                              Vaginal |         20        0.20      100.00
--------------------------------------+-----------------------------------
                                Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 Feb 2018